Study Suggests Blood Helped Keep China's 2,000-Year-Old Huashan Cliff Art From Washing Away

Study suggests blood helped keep China's 2,000-year-old Huashan cliff art from washing away

Researchers have long struggled to explain why the red paintings on the Huashan cliffs in southern China remain visible. In a place marked by heat, humidity, and heavy seasonal rain, artwork that is about 2,000 years old would ordinarily be expected to disappear. Instead, many of the images have survived in striking condition — and, according to a new study, researchers think part of the answer may lie in an unexpected ingredient: blood. Here's …